Undercutter attachment for flexible shaft bench grinders



March 29, "1932;

W. KRAUSE UNDERCUTTER ATTACHMENT FOR FLEXIBLE SHAFT BENCH GRINDERS Filed July 12, 1930 IN VEN TOR.

UNITED sr Patented Maa 29, 1932."

WTLLIAM KRAUSE, orrnoivx, NEWYORK NEW` JERSEY Assis-Nori, `Bv Masiva ASSIGNMENTS, To` y PRATT a WHITNEY COMPANY, ornAnTronncoivnncTrcUnA CORPORATION orav UNDERCUTTER ATTACHMENT 'ron rnnxrnnn simrrrnnonpenrnnnns Application mea :muyv 12,Y

This improvement relates to an attachment f adapted to be used in the hand piece of a flexible shaft bench grinder `JrorY the purpose of cutting ygrooves incommutators and the like after they have been turned to the de sired diameter. Y Y v One object of the present improvement is yto provide a universal jointconnection be-V tween the arbor or shaft of the cutter vand thehand piece and to providemeans for supporting or partially. supporting the attachment ony the hand piece." y e It will beunderstood that the attachment may be used on commutators or cylindricalv surfaces of different. diameters and accordingly, a further object is to provide means for adjusting the device for operation upon commutatore or surfaces of different diameters. v f 1 One form of the improvement is shown in the accompanying; drawing, which shows the attachmentin connection with a flexible shaft hand piece which is yshown partially broken away.A i y Reerringto the drawing, Ait will be seen that the undercutter attachment comprises a frame or body member 1, provided" with a bearing at 2, wherein the cutter shaft or arbor 3 is supported. Acutter t of any preferred form, suchas a slotting cutter, `is

Y shown on the end of the arbor "or shat'f and secured thereto by a nut ,5. Connected to f the'end of the arbor or sha-ft 3'by means oi' a universaljoint 6,71s a connector formed as i" a stud f7, which is shown as securely clampedY in the chuck k8 of the rhand piece 9, which is adapted to be carried onv the end ofa fiexible shaft and driven from the motorof lthe iieXif ble shaft bench grinder. Substantially this form Vof flexible shaft machine is `shown, in

fthe patent to A; B. Bachmann, No. 1,575,307, Y of March 2, 1926,. i

y y In order to provide for angularly support ing the attachment on the hand piece, the

" frame or body member 1 isprovided with a laterallyextending rod or bracket 10, upony which a hinged arm or rod 11 is supported,

thev latter being pivoted at 12, as shown in the drawing. The armor rod 11 is provided n with a slidable clamp member 13, adapted to 19,30.- 'serilNL 467,465.

screw at 14. This clamp member 13 'is prof vided-with a yoke 15 which is shown as clamp;

Aingtheliand-Lpiece 9 to the bracket 13, by Y means of screws 16. The frame or body mem'- V bei` V1 is providedjwith a lege-17 *opposite thef cutter arbor `bearing 2, in vwhioha threaded bolt 18'.. jismounted,4 the `latter, being pro`r vided with a rounded head to serve as-a depth gauge. :Wfhen the depth gauge is adjusted y properly,-itmavbe clamped inadjusted positionfbyanut 19. Y

`ln order to readily-move tlie'attachmenty longitudinally of the commutator'surface, al

guide rollerv20'isxmountedin the lower end, or'abar- 21, provided at its upper end with a slot A22, cooperating withv a screw 23, for permitting adjustment of the position of thek guide rollerf20v radially of the commutator and angularlywith 'reference to its support orangularly as to the surfaceor a radius of the zcommutator. yThe adjustingscrewf23 is' adapted-to clamp the guide roller support-1 ing bar-21 to aslidebracket 24 adapted to vbet adjustably- 'secured-onthe rod y10 byi a suitable set screwl at'25. By means of the adjust-1 ment of the slide bracket 24 along the rod' 10, i Y 1t willbeseen'thatfthe position-ofthe guidev roller 2O canbe varied along-orA parallel to*` '2l-n" order to provide convenientmeans 'for'V the'cutter arbor orshaft 3.y

holding: thev attachment while guiding jit :across the commutator, a suitable handley26`- is provided, the handle vbeing inserted as f l,showniinthe drawing, iiny a screw threaded hole 27 on the upper side of the frame n'nem-k ber 1,""b,ut iiiy desiredythehandle may 'be in-1 serted horizontally in a screwfthreaded hole at 28 at the side of the frame member 1.

The-` undercutter `attachment maybe used for cutting slots in'commutators of dierent diameters and, as shown in the drawing, the

guide roller and depth gauge are indicated asr inl Contact with a commutator of the diameter indicated at A, but by adjusting the support of `the guide roller 20, the device may be adapted for any other diameter voi commutator,a commutatoroflarger diameter being 4 indicated at B'.

` It will be understood that the operation eej of the attachment is relatively simple in that the adjustments are readily made, according to the diameter of the commutator to be operated upon, the depth gauge 18 being ad- 5 justed according to the depth of cut required.

The guide roller 20 is then adjusted angularly to bring its surface tangent to the commutator, and longitudinally or radially by e, means of the slotl and screw connection 22- 23 and ifV necessary, the bracket support 24 may be adjusted inward or outward along the rod 10 according to the diameter of the commutator.

The angular position of the hand piece 9 may be varied by sliding the clamp member 13 longitudinally of the hinged rod 11, the clamp member 18 being secured to the rod 11 by the set screw 14, as previously indicated.

While one formv of the improvement has 20 been shown, it will be understood that vari- A ous modifications and changes may be made in the specific details of construction Without departing from the spirit and scope of the invention.

I claim y 1. An undercutter attachment for flexible shaft bench grinders comprising a frame member, a cutter arbor rotatably supported in said frame member, means including a guide roller for positioning the cutter relative to the Work, and means for adjusting said guide roller transversely and angularly of said arbor.

2. An undercutter attachment for flexible shaft bench grinders, comprising a frame member, a cutter arbor rotatably supported thereby, a depth gauge for controlling the depth of the cut, a. guide roller adapted for rolling contact with the Work and means `for '40 adjusting said'guide roller angularly and longitudinally relatiie to a radius of the work. f

y3. The undercutter attachment for flexible shaft bench grinders, as in claim 2, j' 45 Ywherein means mounted on the frame mem? f ber is adapted for clamping and supporting the flexible shaft hand pieceY angularly of said frame member and a connector adapted to be secured in said hand piece is connected by a universal joint with the end of said, arbor. WILLIAM KRAUSE. 

